近60年重庆市日照时数时空变化特征及影响因素分析  

Spatial and Temporal Variation Characteristics and Influencing Factors of Sunshine Hours in Chongqing in Recent 60 Years

作　　者：姜金戈 李军[1,2,3] 黄成 Jiang Jinge;Li Jun;Huang Cheng(College of Geography and Tourism,Chongqing Normal University,Chongqing 401331,China;Key Laboratory of GIS Application of Chongqing,Chongqing 401331,China;Chongqing Key Laboratory of Earth Surface Processes and Environmental Remote Sensing in Three Gorges Reservoir Area,Chongqing 401331,China)

机构地区：[1]重庆师范大学地理与旅游学院,重庆401331 [2]重庆市高校GIS应用研究重点实验室,重庆401331 [3]三峡库区地表过程与环境遥感重庆市重点实验室,重庆401331

出　　处：《绿色科技》2024年第5期214-220,229,共8页Journal of Green Science and Technology

摘　　要：为探究重庆市日照时数的时空变化规律,基于重庆34个气象站点1961-2020年逐日日照时、风速、温度、总云量、相对湿度资料,使用M-K突变检验、小波分析、时空冷热点模式探测等方法对地区日照时数的时空变化及其影响因素进行分析。结果表明:①重庆日照时数呈现“东北高、东南低”的分布特点。高值集中在巫山、巫溪等地;低值集中在彭水等地。②年均日照时数呈极显著下降趋势,突变年份1979年,振荡主周期为46年。除春季外其他季节均呈现下降趋势。③时空冷热点表明近重庆近60年的日照时数呈现混合聚类、振荡冷点2种模式。④相关系数的季节性差异表明各因素与日照时数的关系并非定值,其中风速、总云量、相对湿度与日照时数相关性四季均显著,降水与温度与日照仅在夏季关系较为紧密。To investigate the spatiotemporal variations of sunshine duration in Chongqing Municipality,and analyze the factors influencing these variations,data from 34 meteorological stations in Chongqing from 1961 to 2020 is utilized,including daily sunshine duration,wind speed,temperature,total cloud cover,and relative humidity.Methods such as the Mann-Kendall(M-K)test,wavelet analysis,and spatiotemporal hotspot detection are employed to analyze the spatiotemporal changes of sunshine duration in the region and identify the influencing factors.The results show that:①The sunshine hours in Chongqing present a distribution characteristic of"high in the northeast and low in the southeast".High values are concentrated in Wushan,Wuxi and other places;low values are concentrated in Pengshui,Youyang and other places.②The annual average sunshine hours showed a very significant downward trend;the abrupt change year was 1979,and the main period of oscillation was 46a.All seasons except spring show a downward trend.③Spatial-temporal pattern mining shows that the sunshine hours in the past 60 years present a mixed clustering and oscillating cold spot pattern.④The seasonal variations in correlation coefficients indicate that the relationships between the factors and sunshine duration are not constant throughout the year.Among them,wind speed,total cloud cover,and relative humidity show significant correlations with sunshine duration in all four seasons.Precipitation and temperature,on the other hand,are closely related to sunshine duration primarily in the summer season.

关 键 词：日照时数 M-K突变检验 小波分析 时空立方体 

分 类 号：P422[天文地球—大气科学及气象学]